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34 * @(#)vfs_vnops.c 8.2 (Berkeley) 1/21/94
35 * $FreeBSD: src/sys/kern/vfs_vnops.c,v 1.87.2.13 2002/12/29 18:19:53 dillon Exp $
38 #include <sys/param.h>
39 #include <sys/systm.h>
41 #include <sys/fcntl.h>
46 #include <sys/mount.h>
47 #include <sys/nlookup.h>
48 #include <sys/vnode.h>
50 #include <sys/filio.h>
51 #include <sys/ttycom.h>
53 #include <sys/sysctl.h>
54 #include <sys/syslog.h>
56 #include <sys/mplock2.h>
58 static int vn_closefile (struct file *fp);
59 static int vn_ioctl (struct file *fp, u_long com, caddr_t data,
60 struct ucred *cred, struct sysmsg *msg);
61 static int vn_read (struct file *fp, struct uio *uio,
62 struct ucred *cred, int flags);
63 static int vn_kqfilter (struct file *fp, struct knote *kn);
64 static int vn_statfile (struct file *fp, struct stat *sb, struct ucred *cred);
65 static int vn_write (struct file *fp, struct uio *uio,
66 struct ucred *cred, int flags);
68 struct fileops vnode_fileops = {
72 .fo_kqfilter = vn_kqfilter,
73 .fo_stat = vn_statfile,
74 .fo_close = vn_closefile,
75 .fo_shutdown = nofo_shutdown
79 * Common code for vnode open operations. Check permissions, and call
80 * the VOP_NOPEN or VOP_NCREATE routine.
82 * The caller is responsible for setting up nd with nlookup_init() and
83 * for cleaning it up with nlookup_done(), whether we return an error
86 * On success nd->nl_open_vp will hold a referenced and, if requested,
87 * locked vnode. A locked vnode is requested via NLC_LOCKVP. If fp
88 * is non-NULL the vnode will be installed in the file pointer.
90 * NOTE: If the caller wishes the namecache entry to be operated with
91 * a shared lock it must use NLC_SHAREDLOCK. If NLC_LOCKVP is set
92 * then the vnode lock will also be shared.
94 * NOTE: The vnode is referenced just once on return whether or not it
95 * is also installed in the file pointer.
98 vn_open(struct nlookupdata *nd, struct file *fp, int fmode, int cmode)
101 struct ucred *cred = nd->nl_cred;
103 struct vattr *vap = &vat;
110 * Certain combinations are illegal
112 if ((fmode & (FWRITE | O_TRUNC)) == O_TRUNC)
116 * Lookup the path and create or obtain the vnode. After a
117 * successful lookup a locked nd->nl_nch will be returned.
119 * The result of this section should be a locked vnode.
121 * XXX with only a little work we should be able to avoid locking
122 * the vnode if FWRITE, O_CREAT, and O_TRUNC are *not* set.
124 nd->nl_flags |= NLC_OPEN;
125 if (fmode & O_APPEND)
126 nd->nl_flags |= NLC_APPEND;
128 nd->nl_flags |= NLC_TRUNCATE;
130 nd->nl_flags |= NLC_READ;
132 nd->nl_flags |= NLC_WRITE;
133 if ((fmode & O_EXCL) == 0 && (fmode & O_NOFOLLOW) == 0)
134 nd->nl_flags |= NLC_FOLLOW;
136 if (fmode & O_CREAT) {
138 * CONDITIONAL CREATE FILE CASE
140 * Setting NLC_CREATE causes a negative hit to store
141 * the negative hit ncp and not return an error. Then
142 * nc_error or nc_vp may be checked to see if the ncp
143 * represents a negative hit. NLC_CREATE also requires
144 * write permission on the governing directory or EPERM
147 nd->nl_flags |= NLC_CREATE;
148 nd->nl_flags |= NLC_REFDVP;
153 * NORMAL OPEN FILE CASE
162 * split case to allow us to re-resolve and retry the ncp in case
166 if (fmode & O_CREAT) {
167 if (nd->nl_nch.ncp->nc_vp == NULL) {
168 if ((error = ncp_writechk(&nd->nl_nch)) != 0)
172 vap->va_mode = cmode;
173 vap->va_fuseflags = fmode; /* FUSE */
175 vap->va_vaflags |= VA_EXCLUSIVE;
176 error = VOP_NCREATE(&nd->nl_nch, nd->nl_dvp, &vp,
181 /* locked vnode is returned */
183 if (fmode & O_EXCL) {
186 error = cache_vget(&nd->nl_nch, cred,
194 if (nd->nl_flags & NLC_SHAREDLOCK) {
195 error = cache_vget(&nd->nl_nch, cred, LK_SHARED, &vp);
197 error = cache_vget(&nd->nl_nch, cred,
205 * We have a locked vnode and ncp now. Note that the ncp will
206 * be cleaned up by the caller if nd->nl_nch is left intact.
208 if (vp->v_type == VLNK) {
212 if (vp->v_type == VSOCK) {
216 if (vp->v_type != VDIR && (fmode & O_DIRECTORY)) {
220 if ((fmode & O_CREAT) == 0) {
221 if (fmode & (FWRITE | O_TRUNC)) {
222 if (vp->v_type == VDIR) {
226 error = vn_writechk(vp, &nd->nl_nch);
229 * Special stale handling, re-resolve the
232 if (error == ESTALE) {
235 if (nd->nl_flags & NLC_SHAREDLOCK) {
236 cache_unlock(&nd->nl_nch);
237 cache_lock(&nd->nl_nch);
239 cache_setunresolved(&nd->nl_nch);
240 error = cache_resolve(&nd->nl_nch,
249 if (fmode & O_TRUNC) {
250 vn_unlock(vp); /* XXX */
251 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */
252 osize = vp->v_filesize;
255 error = VOP_SETATTR_FP(vp, vap, cred, fp);
258 error = VOP_GETATTR(vp, vap);
262 VFS_ACCOUNT(mp, vap->va_uid, vap->va_gid, -osize);
266 * Set or clear VNSWAPCACHE on the vp based on nd->nl_nch.ncp->nc_flag.
267 * These particular bits a tracked all the way from the root.
269 * NOTE: Might not work properly on NFS servers due to the
270 * disconnected namecache.
272 flags = nd->nl_nch.ncp->nc_flag;
273 if ((flags & (NCF_UF_CACHE | NCF_UF_PCACHE)) &&
274 (flags & (NCF_SF_NOCACHE | NCF_SF_PNOCACHE)) == 0) {
275 vsetflags(vp, VSWAPCACHE);
277 vclrflags(vp, VSWAPCACHE);
281 * Setup the fp so VOP_OPEN can override it. No descriptor has been
282 * associated with the fp yet so we own it clean.
284 * f_nchandle inherits nl_nch. This used to be necessary only for
285 * directories but now we do it unconditionally so f*() ops
286 * such as fchmod() can access the actual namespace that was
287 * used to open the file.
290 if (nd->nl_flags & NLC_APPENDONLY)
291 fmode |= FAPPENDONLY;
292 fp->f_nchandle = nd->nl_nch;
293 cache_zero(&nd->nl_nch);
294 cache_unlock(&fp->f_nchandle);
298 * Get rid of nl_nch. vn_open does not return it (it returns the
299 * vnode or the file pointer). Note: we can't leave nl_nch locked
300 * through the VOP_OPEN anyway since the VOP_OPEN may block, e.g.
304 cache_put(&nd->nl_nch);
306 error = VOP_OPEN(vp, fmode, cred, fp);
309 * setting f_ops to &badfileops will prevent the descriptor
310 * code from trying to close and release the vnode, since
311 * the open failed we do not want to call close.
315 fp->f_ops = &badfileops;
322 * Assert that VREG files have been setup for vmio.
324 KASSERT(vp->v_type != VREG || vp->v_object != NULL,
325 ("vn_open: regular file was not VMIO enabled!"));
329 * Return the vnode. XXX needs some cleaning up. The vnode is
330 * only returned in the fp == NULL case.
334 nd->nl_vp_fmode = fmode;
335 if ((nd->nl_flags & NLC_LOCKVP) == 0)
348 vn_opendisk(const char *devname, int fmode, struct vnode **vpp)
353 if (strncmp(devname, "/dev/", 5) == 0)
355 if ((vp = getsynthvnode(devname)) == NULL) {
358 error = VOP_OPEN(vp, fmode, proc0.p_ucred, NULL);
370 * Check for write permissions on the specified vnode. nch may be NULL.
373 vn_writechk(struct vnode *vp, struct nchandle *nch)
376 * If there's shared text associated with
377 * the vnode, try to free it up once. If
378 * we fail, we can't allow writing.
380 if (vp->v_flag & VTEXT)
384 * If the vnode represents a regular file, check the mount
385 * point via the nch. This may be a different mount point
386 * then the one embedded in the vnode (e.g. nullfs).
388 * We can still write to non-regular files (e.g. devices)
389 * via read-only mounts.
391 if (nch && nch->ncp && vp->v_type == VREG)
392 return (ncp_writechk(nch));
397 * Check whether the underlying mount is read-only. The mount point
398 * referenced by the namecache may be different from the mount point
399 * used by the underlying vnode in the case of NULLFS, so a separate
403 ncp_writechk(struct nchandle *nch)
407 if ((mp = nch->mount) != NULL) {
408 if (mp->mnt_flag & MNT_RDONLY)
410 if (mp->mnt_op->vfs_modifying != vfs_stdmodifying)
422 vn_close(struct vnode *vp, int flags, struct file *fp)
426 error = vn_lock(vp, LK_SHARED | LK_RETRY | LK_FAILRECLAIM);
428 error = VOP_CLOSE(vp, flags, fp);
436 * Sequential heuristic.
438 * MPSAFE (f_seqcount and f_nextoff are allowed to race)
442 sequential_heuristic(struct uio *uio, struct file *fp)
445 * Sequential heuristic - detect sequential operation
447 * NOTE: SMP: We allow f_seqcount updates to race.
449 if ((uio->uio_offset == 0 && fp->f_seqcount > 0) ||
450 uio->uio_offset == fp->f_nextoff) {
451 int tmpseq = fp->f_seqcount;
453 tmpseq += (uio->uio_resid + MAXBSIZE - 1) / MAXBSIZE;
454 if (tmpseq > IO_SEQMAX)
456 fp->f_seqcount = tmpseq;
457 return(fp->f_seqcount << IO_SEQSHIFT);
461 * Not sequential, quick draw-down of seqcount
463 * NOTE: SMP: We allow f_seqcount updates to race.
465 if (fp->f_seqcount > 1)
473 * get - lock and return the f_offset field.
474 * set - set and unlock the f_offset field.
476 * These routines serve the dual purpose of serializing access to the
477 * f_offset field (at least on x86) and guaranteeing operational integrity
478 * when multiple read()ers and write()ers are present on the same fp.
482 static __inline off_t
483 vn_get_fpf_offset(struct file *fp)
489 * Shortcut critical path.
491 flags = fp->f_flag & ~FOFFSETLOCK;
492 if (atomic_cmpset_int(&fp->f_flag, flags, flags | FOFFSETLOCK))
493 return(fp->f_offset);
500 if (flags & FOFFSETLOCK) {
501 nflags = flags | FOFFSETWAKE;
502 tsleep_interlock(&fp->f_flag, 0);
503 if (atomic_cmpset_int(&fp->f_flag, flags, nflags))
504 tsleep(&fp->f_flag, PINTERLOCKED, "fpoff", 0);
506 nflags = flags | FOFFSETLOCK;
507 if (atomic_cmpset_int(&fp->f_flag, flags, nflags))
511 return(fp->f_offset);
518 vn_set_fpf_offset(struct file *fp, off_t offset)
524 * We hold the lock so we can set the offset without interference.
526 fp->f_offset = offset;
529 * Normal release is already a reasonably critical path.
533 nflags = flags & ~(FOFFSETLOCK | FOFFSETWAKE);
534 if (atomic_cmpset_int(&fp->f_flag, flags, nflags)) {
535 if (flags & FOFFSETWAKE)
545 static __inline off_t
546 vn_poll_fpf_offset(struct file *fp)
548 #if defined(__x86_64__)
549 return(fp->f_offset);
551 off_t off = vn_get_fpf_offset(fp);
552 vn_set_fpf_offset(fp, off);
558 * Package up an I/O request on a vnode into a uio and do it.
563 vn_rdwr(enum uio_rw rw, struct vnode *vp, caddr_t base, int len,
564 off_t offset, enum uio_seg segflg, int ioflg,
565 struct ucred *cred, int *aresid)
571 if ((ioflg & IO_NODELOCKED) == 0)
572 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
573 auio.uio_iov = &aiov;
575 aiov.iov_base = base;
577 auio.uio_resid = len;
578 auio.uio_offset = offset;
579 auio.uio_segflg = segflg;
581 auio.uio_td = curthread;
582 if (rw == UIO_READ) {
583 error = VOP_READ(vp, &auio, ioflg, cred);
585 error = VOP_WRITE(vp, &auio, ioflg, cred);
588 *aresid = auio.uio_resid;
590 if (auio.uio_resid && error == 0)
592 if ((ioflg & IO_NODELOCKED) == 0)
598 * Package up an I/O request on a vnode into a uio and do it. The I/O
599 * request is split up into smaller chunks and we try to avoid saturating
600 * the buffer cache while potentially holding a vnode locked, so we
601 * check bwillwrite() before calling vn_rdwr(). We also call lwkt_user_yield()
602 * to give other processes a chance to lock the vnode (either other processes
603 * core'ing the same binary, or unrelated processes scanning the directory).
608 vn_rdwr_inchunks(enum uio_rw rw, struct vnode *vp, caddr_t base, int len,
609 off_t offset, enum uio_seg segflg, int ioflg,
610 struct ucred *cred, int *aresid)
618 * Force `offset' to a multiple of MAXBSIZE except possibly
619 * for the first chunk, so that filesystems only need to
620 * write full blocks except possibly for the first and last
623 chunk = MAXBSIZE - (uoff_t)offset % MAXBSIZE;
627 if (vp->v_type == VREG && (ioflg & IO_RECURSE) == 0) {
637 error = vn_rdwr(rw, vp, base, chunk, offset, segflg,
638 ioflg, cred, aresid);
639 len -= chunk; /* aresid calc already includes length */
652 * File pointers can no longer get ripped up by revoke so
653 * we don't need to lock access to the vp.
655 * f_offset updates are not guaranteed against multiple readers
658 vn_read(struct file *fp, struct uio *uio, struct ucred *cred, int flags)
663 KASSERT(uio->uio_td == curthread,
664 ("uio_td %p is not td %p", uio->uio_td, curthread));
665 vp = (struct vnode *)fp->f_data;
668 if (flags & O_FBLOCKING) {
669 /* ioflag &= ~IO_NDELAY; */
670 } else if (flags & O_FNONBLOCKING) {
672 } else if (fp->f_flag & FNONBLOCK) {
675 if (fp->f_flag & O_DIRECT) {
678 if ((flags & O_FOFFSET) == 0 && (vp->v_flag & VNOTSEEKABLE) == 0)
679 uio->uio_offset = vn_get_fpf_offset(fp);
680 vn_lock(vp, LK_SHARED | LK_RETRY);
681 ioflag |= sequential_heuristic(uio, fp);
683 error = VOP_READ_FP(vp, uio, ioflag, cred, fp);
684 fp->f_nextoff = uio->uio_offset;
686 if ((flags & O_FOFFSET) == 0 && (vp->v_flag & VNOTSEEKABLE) == 0)
687 vn_set_fpf_offset(fp, uio->uio_offset);
695 vn_write(struct file *fp, struct uio *uio, struct ucred *cred, int flags)
700 KASSERT(uio->uio_td == curthread,
701 ("uio_td %p is not p %p", uio->uio_td, curthread));
702 vp = (struct vnode *)fp->f_data;
705 if (vp->v_type == VREG &&
706 ((fp->f_flag & O_APPEND) || (flags & O_FAPPEND))) {
710 if (flags & O_FBLOCKING) {
711 /* ioflag &= ~IO_NDELAY; */
712 } else if (flags & O_FNONBLOCKING) {
714 } else if (fp->f_flag & FNONBLOCK) {
717 if (fp->f_flag & O_DIRECT) {
720 if (flags & O_FASYNCWRITE) {
721 /* ioflag &= ~IO_SYNC; */
722 } else if (flags & O_FSYNCWRITE) {
724 } else if (fp->f_flag & O_FSYNC) {
728 if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS))
730 if ((flags & O_FOFFSET) == 0)
731 uio->uio_offset = vn_get_fpf_offset(fp);
733 VFS_MODIFYING(vp->v_mount);
734 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
735 ioflag |= sequential_heuristic(uio, fp);
736 error = VOP_WRITE_FP(vp, uio, ioflag, cred, fp);
737 fp->f_nextoff = uio->uio_offset;
739 if ((flags & O_FOFFSET) == 0)
740 vn_set_fpf_offset(fp, uio->uio_offset);
748 vn_statfile(struct file *fp, struct stat *sb, struct ucred *cred)
753 vp = (struct vnode *)fp->f_data;
754 error = vn_stat(vp, sb, cred);
762 vn_stat(struct vnode *vp, struct stat *sb, struct ucred *cred)
771 error = VOP_GETATTR(vp, vap);
776 * Zero the spare stat fields
782 * Copy from vattr table
784 if (vap->va_fsid != VNOVAL)
785 sb->st_dev = vap->va_fsid;
787 sb->st_dev = vp->v_mount->mnt_stat.f_fsid.val[0];
788 sb->st_ino = vap->va_fileid;
790 switch (vap->va_type) {
808 /* This is a cosmetic change, symlinks do not have a mode. */
809 if (vp->v_mount->mnt_flag & MNT_NOSYMFOLLOW)
810 sb->st_mode &= ~ACCESSPERMS; /* 0000 */
812 sb->st_mode |= ACCESSPERMS; /* 0777 */
824 if (vap->va_nlink > (nlink_t)-1)
825 sb->st_nlink = (nlink_t)-1;
827 sb->st_nlink = vap->va_nlink;
828 sb->st_uid = vap->va_uid;
829 sb->st_gid = vap->va_gid;
830 sb->st_rdev = devid_from_dev(vp->v_rdev);
831 sb->st_size = vap->va_size;
832 sb->st_atimespec = vap->va_atime;
833 sb->st_mtimespec = vap->va_mtime;
834 sb->st_ctimespec = vap->va_ctime;
837 * A VCHR and VBLK device may track the last access and last modified
838 * time independantly of the filesystem. This is particularly true
839 * because device read and write calls may bypass the filesystem.
841 if (vp->v_type == VCHR || vp->v_type == VBLK) {
844 if (dev->si_lastread) {
845 sb->st_atimespec.tv_sec = time_second +
848 sb->st_atimespec.tv_nsec = 0;
850 if (dev->si_lastwrite) {
851 sb->st_atimespec.tv_sec = time_second +
854 sb->st_atimespec.tv_nsec = 0;
860 * According to www.opengroup.org, the meaning of st_blksize is
861 * "a filesystem-specific preferred I/O block size for this
862 * object. In some filesystem types, this may vary from file
864 * Default to PAGE_SIZE after much discussion.
867 if (vap->va_type == VREG) {
868 sb->st_blksize = vap->va_blocksize;
869 } else if (vn_isdisk(vp, NULL)) {
871 * XXX this is broken. If the device is not yet open (aka
872 * stat() call, aka v_rdev == NULL), how are we supposed
873 * to get a valid block size out of it?
877 sb->st_blksize = dev->si_bsize_best;
878 if (sb->st_blksize < dev->si_bsize_phys)
879 sb->st_blksize = dev->si_bsize_phys;
880 if (sb->st_blksize < BLKDEV_IOSIZE)
881 sb->st_blksize = BLKDEV_IOSIZE;
883 sb->st_blksize = PAGE_SIZE;
886 sb->st_flags = vap->va_flags;
888 error = priv_check_cred(cred, PRIV_VFS_GENERATION, 0);
892 sb->st_gen = (u_int32_t)vap->va_gen;
894 sb->st_blocks = vap->va_bytes / S_BLKSIZE;
897 * This is for ABI compatibility <= 5.7 (for ABI change made in
900 sb->__old_st_blksize = sb->st_blksize;
906 * MPALMOSTSAFE - acquires mplock
909 vn_ioctl(struct file *fp, u_long com, caddr_t data, struct ucred *ucred,
912 struct vnode *vp = ((struct vnode *)fp->f_data);
918 switch (vp->v_type) {
921 if (com == FIONREAD) {
922 error = VOP_GETATTR(vp, &vattr);
925 size = vattr.va_size;
926 if ((vp->v_flag & VNOTSEEKABLE) == 0)
927 size -= vn_poll_fpf_offset(fp);
928 if (size > 0x7FFFFFFF)
934 if (com == FIOASYNC) { /* XXX */
946 if (com == FIODTYPE) {
947 if (vp->v_type != VCHR && vp->v_type != VBLK) {
951 *(int *)data = dev_dflags(vp->v_rdev) & D_TYPEMASK;
955 error = VOP_IOCTL(vp, com, data, fp->f_flag, ucred, msg);
956 if (error == 0 && com == TIOCSCTTY) {
957 struct proc *p = curthread->td_proc;
958 struct session *sess;
967 /* Do nothing if reassigning same control tty */
968 if (sess->s_ttyvp == vp) {
974 /* Get rid of reference to old control tty */
988 * Obtain the requested vnode lock
990 * LK_RETRY Automatically retry on timeout
991 * LK_FAILRECLAIM Fail if the vnode is being reclaimed
993 * Failures will occur if the vnode is undergoing recyclement, but not
994 * all callers expect that the function will fail so the caller must pass
995 * LK_FAILOK if it wants to process an error code.
997 * Errors can occur for other reasons if you pass in other LK_ flags,
998 * regardless of whether you pass in LK_FAILRECLAIM
1001 vn_lock(struct vnode *vp, int flags)
1006 error = lockmgr(&vp->v_lock, flags);
1009 } while (flags & LK_RETRY);
1012 * Because we (had better!) have a ref on the vnode, once it
1013 * goes to VRECLAIMED state it will not be recycled until all
1014 * refs go away. So we can just check the flag.
1016 if (error == 0 && (vp->v_flag & VRECLAIMED)) {
1017 if (flags & LK_FAILRECLAIM) {
1018 lockmgr(&vp->v_lock, LK_RELEASE);
1025 #ifdef DEBUG_VN_UNLOCK
1028 debug_vn_unlock(struct vnode *vp, const char *filename, int line)
1030 kprintf("vn_unlock from %s:%d\n", filename, line);
1031 lockmgr(&vp->v_lock, LK_RELEASE);
1037 vn_unlock(struct vnode *vp)
1039 lockmgr(&vp->v_lock, LK_RELEASE);
1048 vn_islocked(struct vnode *vp)
1050 return (lockstatus(&vp->v_lock, curthread));
1054 * Return the lock status of a vnode and unlock the vnode
1055 * if we owned the lock. This is not a boolean, if the
1056 * caller cares what the lock status is the caller must
1057 * check the various possible values.
1059 * This only unlocks exclusive locks held by the caller,
1060 * it will NOT unlock shared locks (there is no way to
1061 * tell who the shared lock belongs to).
1066 vn_islocked_unlock(struct vnode *vp)
1070 vpls = lockstatus(&vp->v_lock, curthread);
1071 if (vpls == LK_EXCLUSIVE)
1072 lockmgr(&vp->v_lock, LK_RELEASE);
1077 * Restore a vnode lock that we previously released via
1078 * vn_islocked_unlock(). This is a NOP if we did not
1079 * own the original lock.
1084 vn_islocked_relock(struct vnode *vp, int vpls)
1088 if (vpls == LK_EXCLUSIVE)
1089 error = lockmgr(&vp->v_lock, vpls);
1096 vn_closefile(struct file *fp)
1100 fp->f_ops = &badfileops;
1101 error = vn_close(((struct vnode *)fp->f_data), fp->f_flag, fp);
1109 vn_kqfilter(struct file *fp, struct knote *kn)
1113 error = VOP_KQFILTER(((struct vnode *)fp->f_data), kn);